Full floating universal tool holder



Nov. 10, 1931. E. GAIRI NG 1,831,382

FULL FLOATING UNIVERSAL TOOL HOLDER Filed July 21 1930 INVENTOR ATTORNEYPatented Nov. 10, I931 UNITED STATES PA ENT OFFICE.

EMIL ammo, or nurnorr, mcnrean, nssronon r Gamma r001. "comm, or

DETROIT, -MIGHIGAN, A CORPORATION OF MICHIGAN FULL FLOATING UNIVERSALTOOL HOLDER Application filed July 21,

angles to eachother, caused by a faulty ig,

or by wear or other irregularities. The driving member or couple isa'shaft formed at each end with a hexagonal head which respectivelyenter hexagonal sockets in the shank member and the tool holder, thuspermitting a full floating double universal joint action.

"" An adjustable collar connects the shank member with the tool holderwithin which is housed a spring bearing at one end. against anoverlapping flange of the collar and at the other end against a flangeprojecting outwardly from the socket of the shank member.

- Aremovable ball raceis also employed to provide a thrust bearingbetween the end wall of the driving socket and the end wall 'of thetool' socket of the holder, and while the latter device is desirablewhen the tool 'socket rotates parallel with or on the axis of themachine tool holder, it must be removed ifan angular float is required.

The primary object therefore of the resent invention is to avoidtheremoval o the ball thrust bearing when an angular'float is required,by providing means whereby the 40 parts may adjust themselves so thatthe tool socket may automatically -shift laterally within predeterminedlimits, not only while .rotating parallel with the axis of the machine 7tool holder or around its ownaxis independently of the axis of thelatter, but angularly to the axis of the shank ofthe driving socket andWithout removing the ball thrust bear-" I it obtain this result a convexdisc,flat

on its upper face to receive the balls of the thrust bearing,-is looselyseated in the conthe spindle.

1930.- Serial No. 469,421.

universal joint action, including a ball thrust 6 bearing.

With the foregoing and other objects in .view which will appear as thedescription proceeds, the invention further resides in the combinationand arrangement of parts and in the details of construction hereinafterdescribed and claimed, it "being understood that changes may be made inthe precise embodiment of the invention herein disclosed withoutdeparting from the spirit of the same.

In the drawings accompanying this specification:

Figure 1 is a side elevation of a full floating holder with parts brokenaway and in section. 75

Figure 2 is a fragmentary elevation and 'cross-sectional.view of theholder, disclosing the convex disc serving to compensate for angular,lateral ,or other displacements or inaccuracies caused by wear ormisalignment of 8 Referring now to the letters of reference placed uponthe drawings.

A denotes a tapered shank holder having a driving socket A of internalpolygonal form in cross-section, with an outwardly projecting flange Aat 'the outer end of the socket portion.

. B indicates a rotatable screw threaded col lar loosely sleeved uponthe socket A. C is a spring coiled upon the socket A bearing atone endagainst the flange A and at the other end against the inwardly directedflange B of the collar.

D designates a tool socket with an out wardly projecting screw-threadedportion D engaged by the collar B,'connecting the parts together.

' E denotes a coupling driving shaft formed at each end with anarc-shaped hexagonal as i . within the collar, where driving head E, Eadapted to respectively engage the hexagonal walls of the drivin socketA at one end of the tapered shank of the tool holder and also the wallof a socket D of like form in the upper end of the tool socket D,thereby providing a double universal driving connection between theshank A and the tool socket D of the holder.

The respectivesides of the hexagonal driving heads E E of the shaft Eare arcshaped in lon itudinal section and are merged into an arc-s apedend E to admit of an universal rocking movement between the taperingshank and the tool socket within predetermined limits, governed by thesize of the opening provided in the collar B, in relation to' the outerdiameter in the socket at the end of the shank.

F denotes a convex disc fiat on its upper face, loosely lodged in theconcave face of the end wall of the tool socket l) of the holder.

G denotes a removable thrust bearin or ball race located between the endwall 0 the driving socket A of the tapering shank and the upper flatsurface of the convex disc F,

the disc being free to move in any direction in the concave end wall ofthe tool socket when under the urge of. the thrust bearing or ball race.H indicates a lock nut.

It will now be apparent that either a parallel or angular floatlngaction will automatically obtain in relation to the respective axis ofthe tapering shank and the tool socket of the holder without removingthe ball'thrust bearing.

I claim 1s:

In an article of the class described, comprising a shank; a toolsupporting member; a collar loosely sleeved upon the shank secured tothe tool supporting member universal driving means coupling the shankand the tool supporting member; a spring housed within the collaradapted to maintain the shank and tool supporting member normally inalignment while permitting the toolsupporting member to shift withinpredetermined limits from axial alignment to parallel relation, or at anangle to the axis of the shank, and a ball thrust bearing located at theend'of the shank and within the collar; in combination with a convexdisc having a flat up r face seated in a concave recess at the encf ofthe tool supporting member and y it may receive the thrust of the ballthrust bearing and coordinate in the alignment of the tool with. the

, work,-regardless of whether a machine spincation.

' EMIL GAIRING.

Having thus described my invention, what

